DStv #blackfriday

I canceled my dstv subscription 25 June and payed up my payment plan according to the information I got from Nathaniel at dstv. I send proof of payment and cancelation via email. They kept on deducting the premium from my account until I made a reversal. Dstv say I owe them R1900, there is just no feedback nor any interest my cancelation. I gave the decoder to a friend and this is where my problem lies... The decoders can not be used. I get the impression that once you try to cancel subscription, dstv is no longer willing to assist you.